add unit tests

jsteuer

2019-12-17 4b91478dd762881f81300bbcbb2edc6fcabc536b

 tsconfig.json

@@ -4,9 +4,10 @@
    "target": "es5",
    "declaration": true,
    "outDir": "./dist",
    "lib": ["DOM","ES2016"]
  },
  "include": [
    "src/**/*"
  ]
    "lib": [
      "DOM",
      "ES2016"
    ],
    "strict": true
  } 
}